Dowel pin former



Dec. 27, 1938. P P LEE- 2,142,035

DOWEL PIN FORMER Filed Oct. 27, 1937 5 Sheets-Sheet l I N VE N TOR. Milffff Qfiflff ATTORNEY.

Dec. 27, 1938.

W. PEASLEE DOWEL PIN FORMER Filed Oct. 27,- 1937 3 Sheets-Sheet 2 INVENTOR. 4/4107; 2 451;:

ATTORNEY.

Dec. 27, 1938. w. P EA LEE 2,142,035

VDOWEL PIN FORMER Filed 001:. 27, 1937 3 Sheets-Sheet 3 INVENTOIQ. Main/ HM? ATTORNEY.

Patented Dec. 27, 1938 UNITED STATES PATENT OFFEQE.

DOWEL PIN FORMER Application October 27, 1937. SerialNo. 171,289

9 Claims.

This invention relates to metal working machines and has particular reference to a novel, improved machine for use in production of dowel pins or the like.

One of the principal objects of the present invention is a machine for rapidly removing the rough or burred edges produced on dowel pins or like articles by the cutting off operation.

A further object of the present invention is the provision of an improved machine utilizable for turning or forming of solid portions of metal articles without the employment of chucks, centers or like holding devices.

A further object of the invention is the provision of an improved machine for the above purposes which will facilitate the rapid feeding of small rolls or like articles thereto and their proper substantially automatic presentation to the cutting tool and control during the forming operation.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawings forming a part thereof and it is to be understood that any modifications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to the drawings in which like reference numerals indicate like or similar parts:

Figure 1 is a side elevation of a machine embodying my improvement with the parts in work receiving position.

Figure 2 is a plan view thereof illustrating the position of the parts at the completion of a forming operation.

Figure 3 is a fragmentary sectional view as on the line 3-3 of Figure 2.

Figure 4 is a sectional view on the line 4-4 of Figure 2.

Figure 5 is a sectional view illustrating the adjustable limiting device as on the line 55 of Figure 1.

Figure 6 is a fragmentary side elevation of the machine illustrating power drive for the pressure roll.

Figure 7 is a fragmentary view partially in section illustrating the manner of employment of a drill or center forming device, and

Figure 8 is a fragmentary view illustrating the employment of a shoulder forming tool in connection with the retractable end stop.

In the drawings the numeral l designates the bed ofa machine embodying my invention, having rising therefrom the standard or frame portion ll provided with the bearing I2 for spindle l3, bearing on one end the drive pulleys l4 and at the opposite end the wheel or cylinder l5, preferably in the form of a wide cast iron or like disc or cylinder.

The member H also supports at the forward portion thereof the shaft or trunnion I6 having oscillatable thereon the frames I1 and I8. Frame H is provided at the inner portion thereof with a head 19 to which is adjustably secured as by bolt 2!] the work rest bracket 2! bearing a work rest member 22. At its opposite end frame I! carries flange 23 provided with limiting abutment screws 24 and 25 selectively engageable with the frame l8 whereby the frames may be moved in one direction or another as a unit by actuation of handle 26 and. at the same time frame I8 may have a limited amount of independent oscillatory movement as respects member ll. Frame l8 loosely receives spindle 2! having at one end a threaded portion 28 and at the opposite end the head 29. Mounted on this spindle are the inner races 30 of the double ball bearing unit 3| carrying the friction work engaging roll 32.

Additionally, there is mounted on spindle 21 adjacent frame Hi the washer 33 having a hub contacting the inner races 3|] and having its outer portion engaged by adjusting screws 34. It will be noted by reference to Figure 3 that there is but a slight amount of play between spindle 21 and frame i8 and the spindle is exteriorly provided with the coned washer 36 retained in position by nut 31. This type of mounting allows of slight oscillation of spindle 21 to an extent determined by the relative tightening of the screws 34, shown as three in number, against member 33.

This makes it possible to effect either a slight positive or negative tilting of the spindle with respect to the supporting frame member.

Carried by the base Ill adjacent the parts just described is a slide 38 adjustable'as by screw 39 and pilot handle 40. This slide is provided with a clamp mechanism 4| of suitable character properly to retain in position the end stop device 42. Additionally, it carries a second clamp mechanism 43 for retention of the cutting tool 44 which is shown as having a quadrantal concave cutting corner at 45 for engagement with an edge such as 46 of the work piece 41.

In operation, the drum I is driven at selected speed from the motor or other prime mover 48 by belt 49 in a clockwise direction as viewed in Figure 1.

With the work supporting mechanism in retracted position as shown in Figure 1 the work piece 41 is placed in the trough formed by the work support 22 and roller 32. Lifting of handle 26 then serves to oscillate the work support unit as an entirety about the trunnion or pinion shaft l6, bringing frame I! into engagement with the adjustable stop 50, whose elevation is controlled by beveled plunger 5! slidably shiftable as by screw 52.

The limitation thus effected is such that the work piece will properly be positioned with one side resting against the friction drive wheel l5 and the opposite edge aligned or substantially aligned with the cutting surface on tool 44. Continued movement of handle 26 will then firmly press roller 32, and thus the work, against wheel [5 and the tilt imparted to roll 32 by suitable adjustment of the screws 34 is preferably such that as the work is frictionally rotated it will be urged rearwardly, as viewed in Figure 2, the member l5 imparting the rotative force while the angled setting of the axis of member 32 produces the necessary feed compartment, effecting longitudinal shifting of the work against the tool to a point limited by end stop 42. During this movement the tool serves to turn off or remove the edge or burr produced by the cutting off or other sizing of the roll or work piece 4'I-in the case of an ordinary dowel pin, therefore producing a slightly rounded tip.

It will, of course, be understood that the exact shape of the tool may be varied and the extent of the cutting operation so that a completely rounded, conical or other form may be reproduced on the work, the feed ordinarily being the result of the angle imparted to member 32. In some instances, however, a suitable manually operable or other pusher may be employed for urging the work in the direction of the cutting tool with a reverse feed component tending to back out the work away from the tool when the pressure is released.

The cutting operation having been completed, reverse or downward rocking of handle 25 tends to swing the upper portion of member l8 outwardly, relieving the pressureagainst the work in the direction of the drive wheel 15, while a continued movement causes member l8 to engage screw 25 and thus reversely swing member I! into the position illustrated in Figure 1.

While it is ordinarily sufficient to apply driving power to the member I5 only-which is preferably rotated at a surface speed in the neighborhood of 1000 feet a minute, producing a corresponding surface speed on the work, it is to be understood that if preferredparticularly for the performance of heavy cutting operations-the member 32 may also be driven. This can be effected as illustrated in Figure 6, for example, by coupling motor 48 to an idler 53 journaled on the trunnion shaft or support [6, and in turn coupled by belt 54 with pulley 55 on shaft 56 coupled preferably by an overrun clutch mechanism indicated at 51 with the wheel 32a. As the wheels l5 and 32 or 32a are preferably of cast iron or other suitable metal, having no appreciable wear, due to their purely rolling frictional contact with the work pieces, the ratio of drive connections from the motor 48 can be made such that their peripheral speeds will be identical and, therefore, correspondingly drive the work.

By the provision of the overrun clutch device,

however, should there be any tendency towards speed differential, this will allow the wheel IE to be the controlling member, preventing introduc tion of positive slippage between work and wheels.

As has been referred to, various terminal shapes may be produced on a work piece by the use of the present invention. Figure 7 fragmentarily indicates the employment of a drill or like device 58 for formation of a center as at 59 in the work piece 47. In Figure 8 there has been illustrated a mechanism for producing a reduced terminal portionshown as cylindricaL-although it will be understood that it may be of conoidal or other form as desired. In this instance, use is made of a retractable end stop device 42a controlled by the bell crank lever 63 having a pin 60 riding in slot ii of a bracket 52 on frame IS. The structure is such that when the parts are in retracted position, and as the work is moved toward the operative position as determined by the member IS, the stop 42a holds back the work in proper position for its terminus to be engaged by the cutting tool 45a. When, however, the parts are in operative position and the work properly presented to the tool as the pressure roll 32 is moved thereagainst, tending to cause by its tilt, the feed of the work, the end stop backs off, allowing the work to move in the direction of the tool to an extent determined by the backed-off position of the end stop.

It is to be noted in the several forms of the invention illustrated that the tool at the completion of the forming operation overlies the terminal portion of the work so that as the unit |'l-l 8 is outwarly oscillated, the tool will tend to catch and tilt the work so that it will drop off the rest member 22 into a suitable receiving chute 64.

From the foregoing description, the operation of the present invention should be readily apparent and it will be seen that there has been provided an improved machine which may be readily set up to accommodate different diameters of work pieces and which is particularly efficient in the handling of short rolls or cylindrical articles for presentation thereof to control of same during terminal formation of the article, whether the terminal operation be the formation of an accurate center, a beveling or rounding of the end or the production of a reduced shoulder portion. In all instances, the machine rapidly, automatically centers the work piece and, without use of chucks or other retaining devices, insures its rotation at proper speed and its feed with respect to the cutting tool, insuring high production of accurately produced articles with the terminal configuration properly concentric with the body of the work piece.

I claim:

1. A metal forming machine of the character described, including a frame or support, a cylindrical drive member rotatably mounted thereon, a work supporting unit pivotally disposed in 0pposition to said driving member including a work support and a work clamp roller movable with and with respect to the work support, means supporting the clamp member for rotation about an axis angularly disposed as respects the axis of the cylindrical drive member, whereby said clamp member will exert a longitudinal feeding action as respects a work piece when the latter is simultaneously engaged by the driving member, support and clamping member, and a metal cutting tool, carried by the frame or support having an operative portion projecting into the potential path of movement of a work piece for terminal formation thereof.

2. A metal forming machine of the character described, including a frame or support, a cylindrical drive member rotatably mounted thereon, a work supporting unit pivotally disposed in 0-pposition to said driving member including a work support and a work clamp roller movable with and with respect to the work support, means supporting the clamp member for rotation about an axis angularly disposed as respects the axis of the cylindrical drive member, whereby said clamp member will exert a longitudinal feeding action as respects a work piece when the latter is simultaneously engaged by the driving member, support and clamping member, a metal cutting tool carried by the frame or support having an operative portion projecting into the potential path of movement of a work piece for terminal formation thereof, and means for limiting the axial movement of the work piece in the direction of the cutting tool.

3. A metal forming machine of the character described, including a frame or support, a cylindrical drive member rotatably mounted thereon, a work supporting unit pivotally disposed in opposition to said driving member including a work support and a work clamp roller movable with and with respect to the work support, means supporting the clamp member for rotation about an axis angularly disposed as respects the axis of the cylindrical drive member, whereby said clamp member will exert a longitudinal feeding action as respects a work piece when the latter is simultaneously engaged by the driving memher, support and clamping member, a metal cutting tool carried by the frame or support having an operative portion projecting into the potential path of movement of a work piece for terminal formation thereof, means for limiting the axial movement of the work piece in the direction of the cutting tool, and means for adjusting the tool in a direction toward and from the axis of the driving member.

4. A machine of the character described, the combination with a frame or support, of a cylindrical driving member rotatably mounted thereon, an oscillatable work supporting member carried by the frame, a work support on said member arcuately movable therewith in a direction toward and from the driving member, means for adjustably limiting said arcuate movement to determine the operative position of the work support, a work clamping member including a rotatable work engaging device movable with and with respect to the work support, means for variably determining the extent of relative movement of said member and the work support, and a metal cutting tool carried by the support and engageable with a work piece when the driving and clamping members are in proximate position for formation of the work piece.

5. A machine of the character described, the combination with a frame or suport, of a cylindrical driving member rotatably mounted thereon, an oscillatable work supporting member carried by the frame, a work support on said member arcuately movable therewith in a direction toward and from the driving member, means for adjustably limiting said arcuate movement to determine the operative position of the work support, a work clamping member including a rotatable Work engaging device movable with and with respect to the work support, means for variably determining the extent of relative movement of said-member and the work support, a metal cutting tool carried by the support and engageable with a work piece when the driving and clamping members are in proximate position for formation of the work piece, and means for adjustably determining the angular relationship between the driving and clamping members whereby a feed component will be exerted on the work piece tending to produce axial movement thereof during the cutting operation.

6. A machine of the character described, the

combination with a frame or support, of a cylindrical driving member rotatably mounted thereon, an oscillatable work supporting member carried by the frame, a work support on said member arcuately movable therewith in a direction toward and from the driving member, means for adjustably limiting said arcuate movement to determine the operative position of the work support, a work clamping member including a rotatable work engaging device movable with and with respect to the work support, means for variably determining the extent of relative movement of said member and the work support, a metal cutting tool carried by the support and engageable with a work piece when the driving and clamping members are in proximate position for formation of the work piece, means for adjustably determining the angular relationship between the driving and clamping members whereby a feed component will be exerted on the work piece tending to produce axial movement thereof during the cutting operation, and means for adjustably determining the extent of said axial movement.

. '7. A machine of the character described, the combination with a frame or support, of a cylindrical driving member rotatably mounted thereon, an oscillatable work supporting member carried by the frame, a work support on said member arcuately movable therewith in a direction toward and from the driving member, means for adjustably limiting said arcuate movement to determine the operative position of the work support, a work clamping member including a rotatable work engaging device movable with and with respect to the work support, means for variably determining the extent of relative movement of said member and the work support, a metal cutting tool carried by the support and engageable with a work piece when the driving and clamping members are in proximate position for formation of the work piece, means for adjustably determining the angular relationship between the driving and clamping members whereby a feed component will be exerted on the work piece tending to produce axial movement thereof during the cutting operation, and means for adjustably deter mining the extent of said axial movement, said cutting tool having a portion projecting into the path of retraction of the work for effecting ejection thereof on withdrawal of the clamping member.

8. A machine for the purpose described including opposed rotary work engaging members and an interposed work support, means to relatively adjust said members to effect a variable clamping pressure thereof on an interposed work piece, means for effecting joint rotation of the rotary work-engaging members at a surface speed such that the interposed work piece will be driven at a proper cut speed, said means including an overthe work, means supporting said members with their axes angularly related whereby an axial feed component is created as respects the work, and a cutting tool adjustably supported adjacent said members and projectable into the path of axial movement of a work piece for performance of a terminal machining operation on said work piece.

9. A machine for the purpose described including opposed rotary work engaging members and an interposed work support, means to relatively adjust said members to effect a variable clamping pressure thereof on an interposed work piece, means for effecting joint rotation of the rotary work-engaging members at a surface speed such that the interposed work piece will be driven at a proper cut speed, means supporting said members with their axes angularly related whereby an axial feed component is created as respects the work, a cutting tool adjustably supported adjacent said members and projectable into the path of axial movement of a work piece for performance of a machining operation on said work piece, a retractable end stop for determination of the axial movement of the work piece, and means coupling said end stop and one of said work engaging members, substantially as and for the purpose described.

WIILE'ITS PEASLEE. 

